Electric fuse.



. F. N. WAKE.

ELECTRIC FUSE.

APPLlCATlON FILED MAR. 22, 1915.

1 207351 Patented Dec. 5,1916.

2 SHEETS-SHEET I.

WITNESSES. INVENTOI? &Z?/ MTORNEYS' F. N. WAKE.

ELECTRIC FUSE.

APPLICATION FILED MAR. 22, 1915.

1,207,351. Patented Dec. 5,1916.

2 SHEETSSHEET 2.

IN VE/V TOR WITNESSES.

:7? 7%; A TTORNEYJ UNITED STATES PATENT OFFICE.

FREDERICK N. WAKE, OF NEW YORK, N. Y., ASSIGNOR TO STERETT R. PREVOST,J. MAXWELL COOTE, EDWARD F. FISHER, AND HIMSELF, TRADING UNDER NAME OFELECTRIGAL SAFETY APPLIANCE COMPANY, OF NEW YORK, N. Y.

ELECTRIC FUSE.

Application filed March 22, 1915.

To all whom it may concern Be it known that I, FREDERICK N. WAKE, acitizen of the United States, and resident of the borough of Bronx,inthe city and State of New York, have invented a new and usefulImprovement in Electric Fuses, of which the following is aspecification.

This invention relates to improvements in electric fuses andparticularly to iniprovements in what are known in the art as renewablefuses, in which the parts are not soldered but are arranged so that theymay be taken apart and new parts substituted as desired.

One of the objects of my invention is to provide a fuse in which therewill be a positive and unvarying contact between the fusible element andthe fuse terminals.

Another object is to provide a fuse in which the partsmay be quickly andconveniently renewed without injury to them.

Another object is to provide a fusible element which will be moreetlicient owing to its novel construction and form. 25 i further objectis to provide a fuse of the type known as the knife blade fuse which isso constructed that when the elements are assembled the knife bladeterininals are positively maintained in alinement and held againstendwise thrusts and the parts held against relative movement.

A. still fur improvements object is to providecertain the form,construction l the several parts whereby sinned and other objects mayarried out.

lnbodiment of my invention in. the accompanying drawlongitudinal centralsection ly in elevation, Fig. 2 is a ovation of the fuse, Fig. 3 is thefuse, Fig. 4c shows, in views of one of the end end plates, one of thetwo rings, and of a portion of Figure l of the e View in s. an end viewperspective, r caps, one of pairs of loo the casing, 'l' tail views ofhe fusible element, one of the connecting heads and one of the terminalblades, Fig. 6 is a perspect ve vlew of the casing, Fig. '2? shows alongitudinal section of the fuse partly in side elevation, Fig. 8 shows,perspective detail, views of the Specification of Letters Patent.

shows in perspective de- Patented Dec. 5, 1916.

Serial No. 16,178.

fusible element, one of its connecting heads, one of the clamping nutsand one of the terminal blades, and Fig. 9 is a perspective of amodifiedform showing a terminal blade and its connecting head.

The device comprises a casing 1 provided with removable end caps 52adapted for screw threaded engagement with the casing. The caps 2 have aportion of their end walls cut away to permit of the insertion of theterminals 3. On the inner faces of the tel" minals 3 and projectinglaterally therefrom are pins 4 which are adapted to enter andfrictionally engage the split sockets 5 of the heads 6.. The heads 6 arealso provided with exteriorly screw threaded pins 7 which are, in turn,adapted to engage interior screw threads on the opposite ends of thefusible element 8. This fusible element 8 is tubular in form and has itssides cut away to form one or more, connecting strips 9, as is clearlyshown in Figs. 1 and 5. I prefer this fusible element to be in the formhere described, but this particular embodiment is not essential in thebroadest aspect of my invention as any well known and approvedsubstitute for this element may be successfully used.

The casing 1 has, on its outer ends, flanges 10 which are partially cutaway to form the transverse notches ll and the terminalsfi have, ontheir inner faces, the transverse rooves 12. The notches ll the grooves12 are adapted to receive a pair of slotted keys 13 which are insertedfrom opposite sides of the casing.

A pair of disks 1 having transverse slits 15 and ventilating holes 16,are adapted to fit into the end caps 2 and are held firmly in placebetween the flanges 10 and the end walls 1'? on the caps 2 when thelatter are screwed home.

The interior of the casing 1 is filled with an arc smotheringcomposition 18 which surrounds the fusible element and its heads and itis retained in the casing by the disks 14.

If it is desired to more firmly clamp the split sockets 5 onto theirrespective pins 4,,

nuts 19 are provided. .These nuts 19 have the outer portions of theirbores tapered for engagement with the tapered surfaces of the splitsockets 5, so that when the nuts 19 are screwed onto their heads 6 thesockets Hill will be firmly clamped on the pins 4 of the terminal blade,this form being shown in Figs. 7 and 8.

Fig. 9 is a modified form in which the split socket is shown on theterminal and its pin on the head.

The device is assembled in the following manner: The screw threaded pins7 on the heads 6 are screwed into the ends of the fusible element 8 andthe pinst on the terminals 3 are forced into the split sockets 5, thusforming a positive contact between the fusible element and itsterminals. The casing 1 is now slipped over the assembled parts and theinterior of the casing filled with an arc smothering material. The keys13 are fitted into the notches 11 and the grooves 12 to lock the partsin the casing, after which the disks 14 are placed over the ends of thecasing'and are clamped in place by screwing on the end caps 2. Shouldthe fusible element burn out, the device may be taken apart in a mannerreadily understood from the above description and a new fusible elementinserted in a very short period of time. v I

lit is evident that slight changes might be resorted to in the-form,construction and arrangement of the several parts without departing fromthe spirit and scope of my invention; hence ll do not wish to limitmyself strictly to the structure herein set forth, but

What I claim is It. lln a fuse, a casing having transverse end notches,a fusible element, removable isomer terminals frictionally connected tosaid fusible elementand having transverse end slots the parts in thecasing.

2. llna fuse, a casing having transverse end notches, removable end capsfor said casing, a fusible element, removable terminals frictionally'connected to said fusible.

element and having transverse end slots in alinement with said notchesand removable keys in said notches and slots for locking the parts insaid casing.

3. In a fuse, a casing having transverse end notches, a fusible element,removable terminals connected to said fusible element and havingtransverse end slots in alinement with said notches and removable keysin said notches and slots for locking the parts in the casing.

4. A fuse, a casing having transverse end notches, removable end capsfor said casing, a fusible element, removable terminals connected tosaid fusible element and having transverse end slots in alinement withsaid notches and removable keys in said notches rannnareir N. WAKE.

Witnesses Srannrr R. Pnnvosr, Enw. F ldrsrrnn.

, in alinement with said notches and removable keys in said notches andslots for locking

